<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			@media screen and (max-width:200px){ /*大于等于800*/
			    /*这里是特定的样式表*/
			    body{background-color: red;}
			}
			body{
				background-color: blue;
			}
		</style>
	</head>
	<body>
	</body>
</html>
